Correct Provisioning documentation link

It was pointing to Prometheus documentation instead.

docs/sources/guides/whats-new-in-v5-1.md

@@ -115,7 +115,7 @@ Grafana v5.1 brings an improved workflow for provisioned dashboards:
 
 
 Available options in the dialog will let you `Copy JSON to Clipboard` and/or `Save JSON to file` which can help you synchronize your dashboard changes back to the provisioning source.
-More information in the [Provisioning documentation](/features/datasources/prometheus/).
+More information in the [Provisioning documentation](/administration/provisioning/).
 
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